<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 16px 12px;
      user-select: none;
    }

    .top-bar {
      display: flex;
      justify-content: center;
      width: 100%;
      margin-bottom: 8px;
    }

    .toggle-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 24px;
      font-size: 16px;
      font-weight: 700;
      color: #1e2945;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 24px;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(0,0,0,0.06);
      transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    }

    .toggle-btn.active {
      background: #fef08a;
      border-color: #eab308;
      box-shadow: 0 0 12px rgba(234, 179, 8, 0.4);
    }

    .svg-container {
      width: 100%;
      max-width: 620px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      overflow: visible;
    }

    /* Electrical flow animation */
    @keyframes flow {
      from { stroke-dashoffset: 24; }
      to { stroke-dashoffset: 0; }
    }

    .current-path {
      stroke-dasharray: 6 6;
      animation: flow 0.8s linear infinite;
    }

    .off-hidden {
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .is-on .off-hidden {
      opacity: 1;
    }

    .switch-slider {
      transition: transform 0.3s ease;
    }

    .is-on .switch-slider {
      transform: translateY(14px);
    }
  </style>
</head>
<body>

  <div class="top-bar">
    <button id="toggleBtn" class="toggle-btn" aria-label="Toggle flashlight power">
      <span id="btnIcon">⚡</span>
      <span id="btnText">Turn On</span>
    </button>
  </div>

  <div class="svg-container">
    <svg id="flashlightSvg" viewBox="0 0 640 330" aria-label="Exploded diagram of flashlight parts">
      <defs>
        
        <linearGradient id="beamGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#fef08a" stop-opacity="0.9" />
          <stop offset="100%" stop-color="#fef08a" stop-opacity="0.05" />
        </linearGradient>
        
        <linearGradient id="batteryGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#3b82f6" />
          <stop offset="100%" stop-color="#1d4ed8" />
        </linearGradient>
        
        <radialGradient id="bulbGlow" cx="50%" cy="50%" r="50%">
          <stop offset="0%" stop-color="#ffffff" />
          <stop offset="40%" stop-color="#fef08a" />
          <stop offset="100%" stop-color="#eab308" stop-opacity="0" />
        </radialGradient>
      </defs>

      
      <g class="off-hidden">
        <polygon points="565,145 635,80 635,240 565,175" fill="url(#beamGrad)" />
        <line x1="575" y1="160" x2="630" y2="135" stroke="#eab308" stroke-width="2" stroke-dasharray="4 3" />
        <line x1="575" y1="160" x2="635" y2="160" stroke="#eab308" stroke-width="3" />
        <line x1="575" y1="160" x2="630" y2="185" stroke="#eab308" stroke-width="2" stroke-dasharray="4 3" />
      </g>

      
      <g transform="translate(20, 110)">
        
        <rect x="0" y="10" width="115" height="80" rx="10" fill="#e0f2fe" stroke="#0284c7" stroke-width="3" stroke-dasharray="6 4" fill-opacity="0.6" />
        <rect x="15" y="22" width="85" height="56" rx="6" fill="#bae6fd" fill-opacity="0.3" stroke="#38bdf8" stroke-width="1.5" />
        
        <line x1="35" y1="20" x2="35" y2="80" stroke="#0284c7" stroke-width="2" opacity="0.5" />
        <line x1="55" y1="20" x2="55" y2="80" stroke="#0284c7" stroke-width="2" opacity="0.5" />
        <line x1="75" y1="20" x2="75" y2="80" stroke="#0284c7" stroke-width="2" opacity="0.5" />
        
        <text x="58" y="120" text-anchor="middle" font-size="15" font-weight="700" fill="#0f172a">1. Case</text>
        <text x="58" y="138" text-anchor="middle" font-size="13" font-weight="500" fill="#64748b">Holds &amp; Protects</text>
      </g>

      
      <g transform="translate(170, 110)">
        
        <rect x="110" y="38" width="10" height="24" rx="2" fill="#94a3b8" stroke="#475569" stroke-width="2" />
        
        <rect x="0" y="20" width="110" height="60" rx="6" fill="url(#batteryGrad)" stroke="#1e3a8a" stroke-width="2.5" />
        <rect x="0" y="20" width="30" height="60" rx="4" fill="#64748b" />
        
        <text x="16" y="55" font-size="18" font-weight="900" fill="#ffffff" text-anchor="middle">-</text>
        <text x="92" y="56" font-size="18" font-weight="900" fill="#ffffff" text-anchor="middle">+</text>
        <text x="58" y="54" font-size="11" font-weight="700" fill="#ffffff" opacity="0.8" text-anchor="middle">1.5V</text>
        
        <text x="60" y="120" text-anchor="middle" font-size="15" font-weight="700" fill="#0f172a">2. Battery</text>
        <text x="60" y="138" text-anchor="middle" font-size="13" font-weight="500" fill="#64748b">Stores Power</text>
      </g>

      
      <g transform="translate(325, 80)">
        
        <rect x="10" y="50" width="80" height="40" rx="6" fill="#f1f5f9" stroke="#64748b" stroke-width="2" />
        
        <circle cx="28" cy="80" r="4" fill="#d97706" />
        <circle cx="72" cy="80" r="4" fill="#d97706" />
        
        <g class="switch-slider">
          <rect x="25" y="32" width="50" height="26" rx="5" fill="#f97316" stroke="#c2410c" stroke-width="2" />
          <line x1="44" y1="40" x2="44" y2="50" stroke="#ffedd5" stroke-width="2" stroke-linecap="round" />
          <line x1="50" y1="40" x2="50" y2="50" stroke="#ffedd5" stroke-width="2" stroke-linecap="round" />
          <line x1="56" y1="40" x2="56" y2="50" stroke="#ffedd5" stroke-width="2" stroke-linecap="round" />
          
          <line x1="28" y1="66" x2="72" y2="66" stroke="#d97706" stroke-width="4" stroke-linecap="round" />
        </g>
        
        <text x="50" y="150" text-anchor="middle" font-size="15" font-weight="700" fill="#0f172a">3. Switch</text>
        <text x="50" y="168" text-anchor="middle" font-size="13" font-weight="500" fill="#64748b">Turns On / Off</text>
      </g>

      
      <g transform="translate(455, 105)">
        
        <polygon points="10,25 75,5 75,85 10,65" fill="#e2e8f0" stroke="#475569" stroke-width="2" />
        
        <rect x="0" y="36" width="14" height="18" fill="#94a3b8" stroke="#475569" stroke-width="1.5" />
        
        <circle cx="24" cy="45" r="14" fill="#fef9c3" stroke="#ca8a04" stroke-width="1.5" />
        <circle id="bulbGlowCircle" class="off-hidden" cx="24" cy="45" r="28" fill="url(#bulbGlow)" />
        <path d="M 18 45 Q 24 35 30 45" fill="none" stroke="#ca8a04" stroke-width="2" />
        
        <path d="M 75 5 Q 85 45 75 85" fill="#e0f2fe" fill-opacity="0.7" stroke="#0284c7" stroke-width="2.5" />
        
        <text x="50" y="125" text-anchor="middle" font-size="15" font-weight="700" fill="#0f172a">4. Bulb &amp; Lens</text>
        <text x="50" y="143" text-anchor="middle" font-size="13" font-weight="500" fill="#64748b">Makes Light</text>
      </g>

      
      <g class="off-hidden">
        
        <path class="current-path" d="M 290 160 L 353 160" fill="none" stroke="#eab308" stroke-width="4" stroke-linecap="round" />
        
        <path class="current-path" d="M 397 160 L 455 160" fill="none" stroke="#eab308" stroke-width="4" stroke-linecap="round" />
        
        <path class="current-path" d="M 465 170 L 465 205 L 180 205 L 180 170" fill="none" stroke="#3b82f6" stroke-width="3" stroke-linecap="round" />
        
        <rect x="252" y="235" width="136" height="24" rx="12" fill="#fef08a" stroke="#eab308" stroke-width="1.5" />
        <text x="320" y="251" text-anchor="middle" font-size="11" font-weight="700" fill="#854d0e">⚡ Electricity Flows</text>
      </g>
    </svg>
  </div>

  <script>
    const btn = document.getElementById('toggleBtn');
    const svg = document.getElementById('flashlightSvg');
    const btnText = document.getElementById('btnText');
    const btnIcon = document.getElementById('btnIcon');
    let isOn = false;

    function toggleFlashlight() {
      isOn = !isOn;
      if (isOn) {
        svg.classList.add('is-on');
        btn.classList.add('active');
        btnText.textContent = 'Turn Off';
        btnIcon.textContent = '💡';
      } else {
        svg.classList.remove('is-on');
        btn.classList.remove('active');
        btnText.textContent = 'Turn On';
        btnIcon.textContent = '⚡';
      }
    }

    btn.addEventListener('click', toggleFlashlight);
  </script>
</body>
</html>

Identifying Parts of Everyday Objects

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
      -webkit-user-select: none;
    }

    /* Part Selector Tabs */
    .part-nav {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      max-width: 520px;
      margin-bottom: 8px;
    }
    .part-btn {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 20px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .part-btn:hover {
      border-color: #cbd5e1;
      background: #f1f5f9;
    }
    .part-btn.active {
      background: #22b7ff;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 8px rgba(34, 183, 255, 0.35);
    }

    /* Bicycle Stage */
    .stage {
      width: 100%;
      max-width: 480px;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      flex: 1;
    }
    svg {
      width: 100%;
      height: auto;
      max-height: 240px;
      overflow: visible;
    }

    /* Clickable interactive hotspots on SVG */
    .part-group {
      cursor: pointer;
      transition: opacity 0.3s ease, filter 0.3s ease;
    }
    .part-group:hover {
      filter: drop-shadow(0 0 4px rgba(34, 183, 255, 0.6));
    }
    .part-group.active {
      filter: drop-shadow(0 0 8px #ff7828);
    }
    .part-group.dimmed {
      opacity: 0.35;
    }

    /* Animation effects */
    .spin-active {
      animation: spin 3s linear infinite;
      transform-origin: center;
    }
    @keyframes spin {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }

    .pulse-glow {
      animation: pulseGlow 1.8s ease-in-out infinite alternate;
    }
    @keyframes pulseGlow {
      0% { stroke-width: 6px; }
      100% { stroke-width: 9px; }
    }

    /* Info card */
    .info-box {
      width: 100%;
      max-width: 480px;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: flex;
      align-items: center;
      gap: 12px;
      min-height: 64px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      margin-top: 6px;
    }
    .info-icon {
      font-size: 26px;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #eff6ff;
      border-radius: 10px;
      flex-shrink: 0;
    }
    .info-text {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }
    .info-title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
    }
    .info-job {
      font-size: 13px;
      color: #475569;
      line-height: 1.35;
    }
  </style>
</head>
<body>

  
  <div class="part-nav" id="partNav">
    <button class="part-btn active" data-part="frame">🚲 Frame</button>
    <button class="part-btn" data-part="wheels">⭕ Wheels</button>
    <button class="part-btn" data-part="handlebars">🧭 Handlebars</button>
    <button class="part-btn" data-part="pedals">⚙️ Pedals & Chain</button>
    <button class="part-btn" data-part="brakes">🛑 Brakes</button>
  </div>

  
  <div class="stage">
    <svg viewBox="0 0 400 240">
      <defs>
        
        <linearGradient id="frameGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#ff5964" />
          <stop offset="100%" stop-color="#f43f5e" />
        </linearGradient>
        <radialGradient id="hubGrad">
          <stop offset="0%" stop-color="#cbd5e1" />
          <stop offset="100%" stop-color="#64748b" />
        </radialGradient>
      </defs>

      
      <ellipse cx="200" cy="222" rx="160" ry="8" fill="#e2e8f0" />

      
      <g id="grp-wheels" class="part-group">
        
        <g id="backWheelSpin" style="transform-origin: 90px 165px;">
          <circle cx="90" cy="165" r="46" fill="none" stroke="#334155" stroke-width="10" />
          <circle cx="90" cy="165" r="41" fill="none" stroke="#cbd5e1" stroke-width="2" />
          
          <line x1="90" y1="124" x2="90" y2="206" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="49" y1="165" x2="131" y2="165" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="61" y1="136" x2="119" y2="194" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="61" y1="194" x2="119" y2="136" stroke="#94a3b8" stroke-width="1.5" />
          <circle cx="90" cy="165" r="8" fill="url(#hubGrad)" />
        </g>

        
        <g id="frontWheelSpin" style="transform-origin: 310px 165px;">
          <circle cx="310" cy="165" r="46" fill="none" stroke="#334155" stroke-width="10" />
          <circle cx="310" cy="165" r="41" fill="none" stroke="#cbd5e1" stroke-width="2" />
          
          <line x1="310" y1="124" x2="310" y2="206" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="269" y1="165" x2="351" y2="165" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="281" y1="136" x2="339" y2="194" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="281" y1="194" x2="339" y2="136" stroke="#94a3b8" stroke-width="1.5" />
          <circle cx="310" cy="165" r="8" fill="url(#hubGrad)" />
        </g>
      </g>

      
      <g id="grp-pedals" class="part-group">
        
        <path d="M 90 160 L 195 158 A 16 16 0 0 1 195 174 L 90 170 A 8 8 0 0 1 90 160 Z"
              fill="none" stroke="#64748b" stroke-width="3.5" stroke-dasharray="4,2" />
        
        <circle cx="195" cy="166" r="16" fill="#94a3b8" stroke="#475569" stroke-width="2" />
        
        <g id="crankArm" style="transform-origin: 195px 166px;">
          <line x1="195" y1="166" x2="195" y2="140" stroke="#1e293b" stroke-width="4" stroke-linecap="round" />
          <rect x="187" y="136" width="16" height="6" rx="2" fill="#ff7828" />
          <line x1="195" y1="166" x2="195" y2="192" stroke="#1e293b" stroke-width="4" stroke-linecap="round" />
          <rect x="187" y="190" width="16" height="6" rx="2" fill="#ff7828" />
        </g>
      </g>

      
      <g id="grp-frame" class="part-group">
        
        <line x1="90" y1="165" x2="195" y2="166" stroke="#f43f5e" stroke-width="6" stroke-linecap="round" />
        <line x1="90" y1="165" x2="160" y2="92" stroke="#f43f5e" stroke-width="6" stroke-linecap="round" />
        
        <line x1="195" y1="166" x2="160" y2="92" stroke="url(#frameGrad)" stroke-width="7" stroke-linecap="round" />
        <line x1="160" y1="92" x2="265" y2="82" stroke="url(#frameGrad)" stroke-width="7" stroke-linecap="round" />
        <line x1="195" y1="166" x2="265" y2="82" stroke="url(#frameGrad)" stroke-width="7" stroke-linecap="round" />
        
        
        <line x1="160" y1="92" x2="155" y2="70" stroke="#475569" stroke-width="5" stroke-linecap="round" />
        <path d="M 138 70 Q 158 66 172 70 Q 155 77 138 70 Z" fill="#1e293b" />
      </g>

      
      <g id="grp-handlebars" class="part-group">
        
        <line x1="265" y1="82" x2="310" y2="165" stroke="#f43f5e" stroke-width="6" stroke-linecap="round" />
        
        <line x1="265" y1="82" x2="268" y2="52" stroke="#64748b" stroke-width="5" stroke-linecap="round" />
        
        <path d="M 252 50 C 265 44, 275 44, 284 56" fill="none" stroke="#1e293b" stroke-width="5" stroke-linecap="round" />
        
        <circle cx="284" cy="56" r="4.5" fill="#ff7828" />
      </g>

      
      <g id="grp-brakes" class="part-group">
        
        <line x1="274" y1="50" x2="266" y2="58" stroke="#0284c7" stroke-width="3" stroke-linecap="round" />
        
        <path d="M 268 56 Q 285 75 292 125" fill="none" stroke="#0284c7" stroke-width="2" stroke-dasharray="3,2" />
        
        <rect x="288" y="122" width="10" height="7" rx="2" fill="#0284c7" />
        
        <rect x="110" y="132" width="10" height="7" rx="2" fill="#0284c7" />
      </g>
    </svg>
  </div>

  
  <div class="info-box" id="infoBox">
    <div class="info-icon" id="infoIcon">🚲</div>
    <div class="info-text">
      <div class="info-title" id="infoTitle">Frame</div>
      <div class="info-job" id="infoJob">Holds all the parts together in one strong body.</div>
    </div>
  </div>

  <script>
    const partData = {
      frame: {
        icon: '🚲',
        title: 'Frame',
        job: 'Holds all the parts together in one strong body.'
      },
      wheels: {
        icon: '⭕',
        title: 'Wheels & Tires',
        job: 'Roll smoothly over the ground to move you forward.'
      },
      handlebars: {
        icon: '🧭',
        title: 'Handlebars',
        job: 'Steers the front wheel left and right.'
      },
      pedals: {
        icon: '⚙️',
        title: 'Pedals & Chain',
        job: 'Feet push pedals, and the chain turns the back wheel.'
      },
      brakes: {
        icon: '🛑',
        title: 'Brakes',
        job: 'Squeezes the wheels to slow down and stop safely.'
      }
    };

    const buttons = document.querySelectorAll('.part-btn');
    const partGroups = document.querySelectorAll('.part-group');
    const backSpin = document.getElementById('backWheelSpin');
    const frontSpin = document.getElementById('frontWheelSpin');
    const crankArm = document.getElementById('crankArm');
    const infoIcon = document.getElementById('infoIcon');
    const infoTitle = document.getElementById('infoTitle');
    const infoJob = document.getElementById('infoJob');

    function selectPart(partKey) {
      // Update navigation buttons
      buttons.forEach(btn => {
        btn.classList.toggle('active', btn.dataset.part === partKey);
      });

      // Update SVG part glows and dimming
      partGroups.forEach(grp => {
        if (grp.id === 'grp-' + partKey) {
          grp.classList.add('active');
          grp.classList.remove('dimmed');
        } else {
          grp.classList.remove('active');
          grp.classList.add('dimmed');
        }
      });

      // Interactive visual actions per part
      if (partKey === 'wheels') {
        backSpin.classList.add('spin-active');
        frontSpin.classList.add('spin-active');
        crankArm.classList.remove('spin-active');
      } else if (partKey === 'pedals') {
        crankArm.classList.add('spin-active');
        backSpin.classList.add('spin-active');
        frontSpin.classList.remove('spin-active');
      } else {
        backSpin.classList.remove('spin-active');
        frontSpin.classList.remove('spin-active');
        crankArm.classList.remove('spin-active');
      }

      // Update text card
      const data = partData[partKey];
      infoIcon.textContent = data.icon;
      infoTitle.textContent = data.title;
      infoJob.textContent = data.job;
    }

    // Attach click listeners to buttons
    buttons.forEach(btn => {
      btn.addEventListener('click', () => selectPart(btn.dataset.part));
    });

    // Attach click listeners to SVG parts
    partGroups.forEach(grp => {
      const partKey = grp.id.replace('grp-', '');
      grp.addEventListener('click', () => selectPart(partKey));
    });

    // Auto-cycle gently on start (pedagogical pace)
    const partOrder = ['frame', 'wheels', 'handlebars', 'pedals', 'brakes'];
    let currentIndex = 0;
    let autoTimer = setInterval(() => {
      currentIndex = (currentIndex + 1) % partOrder.length;
      selectPart(partOrder[currentIndex]);
    }, 4500);

    // Stop auto-cycling once user touches/clicks any part
    document.body.addEventListener('pointerdown', () => {
      if (autoTimer) {
        clearInterval(autoTimer);
        autoTimer = null;
      }
    }, { once: true });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Fix the Broken Object</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

    #status {
      font-size: 14px;
      font-weight: 600;
      text-align: center;
      padding: 8px 14px;
      border-radius: 20px;
      background: #fee2e2;
      color: #991b1b;
      max-width: 92%;
      transition: all 0.3s ease;
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    #status.success {
      background: #dcfce7;
      color: #166534;
    }

    .scene-wrap {
      width: 100%;
      max-width: 440px;
      position: relative;
      margin: 4px 0;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
    }

    .spokes {
      transform-origin: center;
    }

    .spinning {
      animation: spin 2s linear infinite;
    }

    .rear-spin {
      transform-origin: 90px 150px;
    }

    .front-spin {
      transform-origin: 310px 150px;
    }

    .pedal-spin {
      transform-origin: 190px 150px;
    }

    @keyframes spin {
      100% { transform: rotate(360deg); }
    }

    .choices {
      display: flex;
      gap: 12px;
      width: 100%;
      max-width: 400px;
      justify-content: center;
    }

    .choice-btn {
      flex: 1;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      cursor: pointer;
      font-size: 14px;
      font-weight: 600;
      color: #1e2945;
      box-shadow: 0 2px 4px rgba(0,0,0,0.04);
      transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
    }

    .choice-btn:active {
      background: #f1f5f9;
    }

    .choice-btn.shake {
      animation: shake 0.4s ease;
      border-color: #ef4444;
    }

    .choice-btn.correct {
      border-color: #22c55e;
      background: #f0fdf4;
      pointer-events: none;
    }

    .choice-btn .icon {
      font-size: 26px;
      line-height: 1;
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      25% { transform: translateX(-6px); }
      75% { transform: translateX(6px); }
    }

    /* Confetti particle container */
    .particle {
      position: absolute;
      width: 8px;
      height: 8px;
      border-radius: 2px;
      pointer-events: none;
      animation: pop 0.9s ease-out forwards;
    }

    @keyframes pop {
      0% { transform: translate(0, 0) scale(1); opacity: 1; }
      100% { transform: translate(var(--tx), var(--ty)) rotate(180deg) scale(0); opacity: 0; }
    }
  </style>
</head>
<body>

  <div id="status">Pedals won't turn the wheel!</div>

  <div class="scene-wrap" id="scene">
    <svg viewBox="0 0 400 210">
      
      <line x1="20" y1="195" x2="380" y2="195" stroke="#cbd5e1" stroke-width="3" stroke-linecap="round" />

      
      <circle cx="90" cy="150" r="44" stroke="#475569" stroke-width="6" fill="none" />
      <g id="rearSpokes" class="rear-spin">
        <line x1="90" y1="106" x2="90" y2="194" stroke="#94a3b8" stroke-width="2" />
        <line x1="46" y1="150" x2="134" y2="150" stroke="#94a3b8" stroke-width="2" />
        <line x1="59" y1="119" x2="121" y2="181" stroke="#94a3b8" stroke-width="2" />
        <line x1="59" y1="181" x2="121" y2="119" stroke="#94a3b8" stroke-width="2" />
      </g>
      <circle cx="90" cy="150" r="8" fill="#334155" />

      
      <circle cx="310" cy="150" r="44" stroke="#475569" stroke-width="6" fill="none" />
      <g id="frontSpokes" class="front-spin">
        <line x1="310" y1="106" x2="310" y2="194" stroke="#94a3b8" stroke-width="2" />
        <line x1="266" y1="150" x2="354" y2="150" stroke="#94a3b8" stroke-width="2" />
        <line x1="279" y1="119" x2="341" y2="181" stroke="#94a3b8" stroke-width="2" />
        <line x1="279" y1="181" x2="341" y2="119" stroke="#94a3b8" stroke-width="2" />
      </g>
      <circle cx="310" cy="150" r="8" fill="#334155" />

      
      <g id="missingChainIndicator" opacity="0.6">
        <path d="M 90 144 L 190 144 A 12 12 0 0 1 190 156 L 90 156 A 6 6 0 0 1 90 144 Z" 
              fill="none" stroke="#ef4444" stroke-width="2.5" stroke-dasharray="4,4" />
        <text x="140" y="136" text-anchor="middle" font-size="11" font-weight="bold" fill="#dc2626">Missing Part ❓</text>
      </g>

      
      <g id="chain" opacity="0">
        <path d="M 90 143 L 190 143 A 14 14 0 0 1 190 157 L 90 157 A 7 7 0 0 1 90 143 Z" 
              fill="none" stroke="#0284c7" stroke-width="4" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M 90 143 L 190 143 A 14 14 0 0 1 190 157 L 90 157 A 7 7 0 0 1 90 143 Z" 
              fill="none" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="3,3" />
      </g>

      
      
      <line x1="90" y1="150" x2="160" y2="78" stroke="#0284c7" stroke-width="5" stroke-linecap="round" />
      <line x1="90" y1="150" x2="190" y2="150" stroke="#0284c7" stroke-width="5" stroke-linecap="round" />
      
      <line x1="190" y1="150" x2="160" y2="78" stroke="#0284c7" stroke-width="6" stroke-linecap="round" />
      <line x1="160" y1="78" x2="270" y2="78" stroke="#0284c7" stroke-width="6" stroke-linecap="round" />
      <line x1="190" y1="150" x2="270" y2="78" stroke="#0284c7" stroke-width="6" stroke-linecap="round" />
      
      <line x1="270" y1="78" x2="310" y2="150" stroke="#0284c7" stroke-width="5" stroke-linecap="round" />
      <line x1="270" y1="78" x2="265" y2="52" stroke="#0284c7" stroke-width="5" stroke-linecap="round" />

      
      <line x1="160" y1="78" x2="155" y2="60" stroke="#475569" stroke-width="4" />
      <path d="M 140 60 Q 155 56 172 60 Q 165 65 140 60 Z" fill="#1e2945" />

      
      <path d="M 252 50 L 265 52 L 275 48" fill="none" stroke="#1e2945" stroke-width="4" stroke-linecap="round" />

      
      <g id="pedals" class="pedal-spin">
        <circle cx="190" cy="150" r="13" fill="#64748b" stroke="#334155" stroke-width="2" />
        <line x1="190" y1="134" x2="190" y2="166" stroke="#1e2945" stroke-width="4" stroke-linecap="round" />
        <rect x="184" y="129" width="12" height="5" rx="2" fill="#0f172a" />
        <rect x="184" y="166" width="12" height="5" rx="2" fill="#0f172a" />
      </g>
    </svg>
  </div>

  <div class="choices">
    <button class="choice-btn" id="btnDuck" onclick="handleChoice('duck')">
      <span class="icon">🦆</span>
      <span>Rubber Duck</span>
    </button>
    <button class="choice-btn" id="btnChain" onclick="handleChoice('chain')">
      <span class="icon">⛓️</span>
      <span>Bike Chain</span>
    </button>
  </div>

  <script>
    function playTone(freq, dur = 0.2) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.frequency.value = freq;
        osc.connect(gain);
        gain.connect(ctx.destination);
        gain.gain.setValueAtTime(0.2, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + dur);
        osc.start();
        osc.stop(ctx.currentTime + dur);
      } catch (e) {}
    }

    function createConfetti() {
      const colors = ['#38bdf8', '#22c55e', '#f59e0b', '#ec4899', '#8b5cf6'];
      const scene = document.getElementById('scene');
      for (let i = 0; i < 20; i++) {
        const p = document.createElement('div');
        p.className = 'particle';
        p.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
        p.style.left = '50%';
        p.style.top = '65%';
        const tx = (Math.random() - 0.5) * 160 + 'px';
        const ty = (Math.random() - 0.7) * 120 + 'px';
        p.style.setProperty('--tx', tx);
        p.style.setProperty('--ty', ty);
        scene.appendChild(p);
        setTimeout(() => p.remove(), 900);
      }
    }

    function handleChoice(type) {
      const status = document.getElementById('status');
      const btnDuck = document.getElementById('btnDuck');
      const btnChain = document.getElementById('btnChain');

      if (type === 'duck') {
        playTone(180, 0.25);
        btnDuck.classList.remove('shake');
        void btnDuck.offsetWidth;
        btnDuck.classList.add('shake');
        status.textContent = "A toy duck can't connect the parts!";
        if (window.answerIncorrect) {
          window.answerIncorrect({ answer: 'duck', feedback: 'A rubber duck cannot transfer pedal force.' });
        }
      } else if (type === 'chain') {
        playTone(523.25, 0.15);
        setTimeout(() => playTone(659.25, 0.3), 150);

        btnChain.classList.add('correct');
        btnDuck.style.opacity = '0.5';
        btnDuck.style.pointerEvents = 'none';

        document.getElementById('missingChainIndicator').style.display = 'none';
        document.getElementById('chain').style.opacity = '1';

        document.getElementById('rearSpokes').classList.add('spinning');
        document.getElementById('frontSpokes').classList.add('spinning');
        document.getElementById('pedals').classList.add('spinning');

        status.classList.add('success');
        status.textContent = 'Chain connects pedals to wheel! ✓';

        createConfetti();

        if (window.answerCorrect) {
          window.answerCorrect({ answer: 'chain', explanation: 'The chain connects pedals to the rear wheel.' });
        }
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Parts of Scissors</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 16px;
      user-select: none;
    }

    .diagram-area {
      position: relative;
      width: 100%;
      max-width: 500px;
      height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Scissor arm transformations */
    .arm {
      transform-origin: 210px 140px;
      transition: transform 1s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .arm-top {
      transform: rotate(-14deg);
    }

    .arm-bottom {
      transform: rotate(14deg);
    }

    .closed .arm-top {
      transform: rotate(0deg);
    }

    .closed .arm-bottom {
      transform: rotate(0deg);
    }

    /* Paper cut animation */
    .paper-top, .paper-bottom {
      transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .closed .paper-top {
      transform: translate(6px, -18px) rotate(-6deg);
    }

    .closed .paper-bottom {
      transform: translate(6px, 18px) rotate(6deg);
    }

    /* Callout Cards */
    .labels-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 500px;
      margin-top: 8px;
    }

    .part-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 10px;
      text-align: center;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .part-card.active {
      border-color: #3b82f6;
      box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
    }

    .part-tag {
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 2px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    .tag-orange { color: #ea580c; }
    .tag-gray { color: #475569; }
    .tag-blue { color: #2563eb; }

    .part-desc {
      font-size: 12px;
      color: #64748b;
      line-height: 1.25;
    }

    /* Action button */
    .controls {
      margin-top: 12px;
      display: flex;
      gap: 8px;
    }

    .btn {
      appearance: none;
      background: #0284c7;
      color: #ffffff;
      border: none;
      border-radius: 9999px;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
      transition: background 0.15s, opacity 0.15s;
    }

    .btn:active {
      background: #0369a1;
    }

    @media (max-width: 400px) {
      .diagram-area { height: 230px; }
      .part-tag { font-size: 12px; }
      .part-desc { font-size: 11px; }
      .btn { font-size: 13px; padding: 8px 18px; }
    }
  </style>
</head>
<body>

  
  <div class="diagram-area" id="diagramArea">
    <svg viewBox="0 0 460 260" aria-label="Scissors Diagram">
      <defs>
        
        <linearGradient id="bladeGrad1" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#f1f5f9" />
          <stop offset="60%" stop-color="#cbd5e1" />
          <stop offset="100%" stop-color="#94a3b8" />
        </linearGradient>
        <linearGradient id="bladeGrad2" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#e2e8f0" />
          <stop offset="50%" stop-color="#94a3b8" />
          <stop offset="100%" stop-color="#64748b" />
        </linearGradient>
        <linearGradient id="orangeGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#fb923c" />
          <stop offset="100%" stop-color="#ea580c" />
        </linearGradient>
        <linearGradient id="pinGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#ffffff" />
          <stop offset="60%" stop-color="#94a3b8" />
          <stop offset="100%" stop-color="#475569" />
        </linearGradient>

        
        <filter id="softShadow" x="-10%" y="-10%" width="130%" height="130%">
          <feDropShadow dx="1" dy="3" stdDeviation="2.5" flood-color="#0f172a" flood-opacity="0.15"/>
        </filter>
      </defs>

      
      <g id="paperGroup">
        
        <g class="paper-top">
          <path d="M 330 65 L 395 65 Q 400 65 400 70 L 400 138 L 330 138 Z" fill="#fef08a" stroke="#ca8a04" stroke-width="1.5" />
          <line x1="345" y1="85" x2="385" y2="85" stroke="#eab308" stroke-width="1.5" stroke-linecap="round" />
          <line x1="345" y1="105" x2="385" y2="105" stroke="#eab308" stroke-width="1.5" stroke-linecap="round" />
        </g>
        
        <g class="paper-bottom">
          <path d="M 330 142 L 400 142 L 400 210 Q 400 215 395 215 L 330 215 Z" fill="#fef08a" stroke="#ca8a04" stroke-width="1.5" />
          <line x1="345" y1="162" x2="385" y2="162" stroke="#eab308" stroke-width="1.5" stroke-linecap="round" />
          <line x1="345" y1="182" x2="385" y2="182" stroke="#eab308" stroke-width="1.5" stroke-linecap="round" />
        </g>
      </g>

      
      <g class="arm arm-bottom" filter="url(#softShadow)">
        
        <path d="M 210 140 L 360 128 Q 375 132 375 140 Q 375 148 360 152 L 210 140 Z" fill="url(#bladeGrad1)" stroke="#64748b" stroke-width="1.5" />
        
        <circle cx="365" cy="140" r="4.5" fill="#94a3b8" />
        
        
        <path d="M 210 140 L 160 185 L 140 180 L 195 135 Z" fill="#94a3b8" />
        
        
        <path d="M 155 185 C 165 215 130 235 95 230 C 60 225 55 185 85 170 C 115 155 145 165 155 185 Z" fill="url(#orangeGrad)" stroke="#c2410c" stroke-width="2" />
        
        <ellipse cx="105" cy="198" rx="20" ry="14" transform="rotate(-15 105 198)" fill="#f8fafc" stroke="#c2410c" stroke-width="2" />
      </g>

      
      <g class="arm arm-top" filter="url(#softShadow)">
        
        <path d="M 210 140 L 360 128 Q 375 132 375 140 Q 375 148 360 152 L 210 140 Z" fill="url(#bladeGrad2)" stroke="#475569" stroke-width="1.5" />
        <circle cx="365" cy="140" r="4.5" fill="#64748b" />
        
        
        <path d="M 210 140 L 160 95 L 140 100 L 195 145 Z" fill="#64748b" />
        
        
        <path d="M 155 95 C 165 65 130 45 95 50 C 60 55 55 95 85 110 C 115 125 145 115 155 95 Z" fill="url(#orangeGrad)" stroke="#c2410c" stroke-width="2" />
        
        <ellipse cx="105" cy="82" rx="20" ry="14" transform="rotate(15 105 82)" fill="#f8fafc" stroke="#c2410c" stroke-width="2" />
      </g>

      
      <g id="pivotPin">
        <circle cx="210" cy="140" r="10" fill="url(#pinGrad)" stroke="#334155" stroke-width="2" />
        <circle cx="210" cy="140" r="4" fill="#475569" />
        <line x1="207" y1="140" x2="213" y2="140" stroke="#f8fafc" stroke-width="1.5" stroke-linecap="round" />
      </g>

      
      <g stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="3 3">
        
        <line x1="85" y1="42" x2="85" y2="24" />
        <circle cx="85" cy="42" r="2.5" fill="#ea580c" />
        
        <line x1="210" y1="126" x2="210" y2="24" />
        <circle cx="210" cy="126" r="2.5" fill="#475569" />
        
        <line x1="330" y1="116" x2="330" y2="24" />
        <circle cx="330" cy="116" r="2.5" fill="#0284c7" />
      </g>
    </svg>
  </div>

  
  <div class="labels-grid">
    <div class="part-card">
      <div class="part-tag tag-orange">🟠 Handles</div>
      <div class="part-desc">Hold & squeeze</div>
    </div>
    <div class="part-card">
      <div class="part-tag tag-gray">⚙️ Pivot Pin</div>
      <div class="part-desc">Holds & rotates</div>
    </div>
    <div class="part-card">
      <div class="part-tag tag-blue">⚔️ Blades</div>
      <div class="part-desc">Slide to cut</div>
    </div>
  </div>

  
  <div class="controls">
    <button class="btn" id="toggleBtn" onclick="toggleScissors()">
      <span id="btnIcon">✂️</span>
      <span id="btnText">Squeeze Scissors</span>
    </button>
  </div>

  <script>
    let isSqueezed = false;
    const diagram = document.getElementById('diagramArea');
    const btnText = document.getElementById('btnText');
    const btnIcon = document.getElementById('btnIcon');

    function toggleScissors() {
      isSqueezed = !isSqueezed;
      if (isSqueezed) {
        diagram.classList.add('closed');
        btnText.textContent = 'Open Scissors';
        btnIcon.textContent = '🔄';
      } else {
        diagram.classList.remove('closed');
        btnText.textContent = 'Squeeze Scissors';
        btnIcon.textContent = '✂️';
      }
    }
  </script>
</body>
</html>

OGS.2.PS.5

Aligned learning resources

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